The moment you have been waiting for has finally arrived: Minecraft 1.7 – Snapshot 13w36a is out! This Snapshot covers a pile of awesome new features, so let’s just jump right in, shall we?
To get the snapshot, open your launcher and press the “New Profile” button. Call it “snapshots” and check the box saying “Enable experimental development snapshots”, and save. To switch to the normal version, you can select it in the dropdown at the bottom left corner of the launcher.